D-Link DWC-1000

D-Link DWC-1000 User Manual 163
Section 5 - Advanced Network Conguration
Load Balancing
Path: Network > Internet (IPv4) > Option Mode
This feature allows you to use multiple Option links (and presumably multiple ISP’s) simultaneously. After
conguring more than one Option port, the load balancing option is available to carry trac over more than
one link. Protocol bindings are used to segregate and assign services over one Option port in order to manage
internet ow. The congured failure detection method is used at regular intervals on all congured Option ports
when in Load Balancing mode.
This controller currently supports three algorithms for Load Balancing:
Round Robin: This algorithm is particularly useful when the connection speed of one Option port
greatly diers from another. In this case you can dene protocol bindings to route low-latency services
(such as VOIP) over the higher -speed link and let low-volume background trac (such as SMTP) go over
the lower speed link. Protocol binding is explained in next section.
Spillover: If Spillover method is selected, the primary Option acts as a dedicated link until a dened
bandwidth threshold are reached. After this, the secondary Option will be used for new connections.
Inbound connections on the secondary Option are permitted with this mode, as the spillover logic
governs outbound connections moving from the primary to secondary Option. You can congure
spillover mode by using following options:
• Load Tolerance: It is the percentage of bandwidth after which the controller switches to
secondary Option.
• Max Bandwidth: This sets the maximum bandwidth tolerable by the primary Option for
outbound trac.
If the link bandwidth of outbound trac goes above the load tolerance value of max bandwidth, the
controller will spillover the next connections to secondary Option.
For example, if the maximum bandwidth of primary Option is 1Kbps and the load tolerance is set to 70. Now
every time a new connection is established the bandwidth increases. After a certain number of connections say
bandwidth reached 70% of 1Kbps, the new outbound connections will be spilled over to secondary Option. The
maximum value of load tolerance is 80% and the minimum is 20%.
Load balancing is particularly useful when the connection speed of one Option port greatly diers from another.
In this case you can dene protocol bindings to route low-latency services (such as VOIP) over the higher-speed
link and let low-volume background trac (such as SMTP) go over the lower speed link.